MoS₂ Nanoprobe for MicroRNA Quantification Based on Duplex-Specific Nuclease Signal Amplification

Area of Science:

• Biomolecular Engineering
• Nanotechnology
• Molecular Diagnostics

Background:

• MicroRNAs (miRNAs) are crucial regulators in biological processes and valuable biomarkers for disease diagnosis and therapy.
• Accurate detection of miRNAs is challenging due to their small size, low concentration, instability, and similar sequences.

Purpose of the Study:

• To develop a novel nanoprobe for highly sensitive and selective detection of microRNAs.
• To leverage molybdenum disulfide (MoS2) nanosheets and molecular beacons (MBs) with duplex-specific nuclease-mediated signal amplification (DSNMSA) for enhanced miRNA detection.

Main Methods:

• Design of MoS2-loaded MB nanoprobes for miRNA detection.
• Utilizing MoS2 as an efficient fluorescence quencher and employing cyclic DSNMSA for signal amplification.
• Assessing sensitivity, selectivity for single-base mismatch discrimination, and multiplexed detection capabilities.

Main Results:

• MoS2 nanosheets demonstrated high affinity for MBs and efficient fluorescence quenching.
• The developed nanoprobes achieved a limit of detection four orders of magnitude lower than traditional methods.
• High selectivity was achieved, enabling discrimination of miRNA sequences with single-base differences, and multiplexed detection was demonstrated.

Conclusions:

• The MoS2-loaded MB nanoprobes offer superior sensitivity and specificity for miRNA detection.
• This novel method provides a promising tool for simultaneous quantitative analysis of multiple miRNAs.
• The approach holds significant potential for applications in biomedical research and clinical diagnostics.